It depends on the complexity of the project and your ability to do the job well yourself. Really consider whether you have the time, skills, tools, help and legal knowledge of local regulations to get the job done. While you could save up to an estimated 20 percent of the project cost doing the work yourself—there are plenty of how-to books and workshops offered by home improvement stores to guide you—be aware that you could also end up spending more money and time if you botch the job or unforeseen problems arise. Think, too, about resale value. If the quality of your work is less than professional, your home’s value could drop. So, unless you’re highly skilled or experienced, shy away from major home improvements that involve structural changes. Stick to building shelves, painting and other minor improvements instead.